The balanced rotating assembly (typically includes stroker crankshaft, pistons, rings, connecting rods, rod bearings, and balancer) featured in this engine:

• 4.250" stroke crank
• 6.700" big beam forged rods with ARP rod bolts
• 9.8 to 1 compression forged pistons

More special features of this engine include:

• Seasoned 2-bolt main 390 block that has been sonic tested
• New Hydraulic flat tappet cam with .584"Int/.588"Exh valve lift
• Cast iron big port heads
• 2.090"Int/1.660"Exh Cobra Jet "CJ" stainless swirl polished valves with undercut stems for improved flow
• Heads have the 8 bolt exhaust manifold pattern
• Roller-tip adjustable rocker assembly is held down by studs for added strength
• New Hardened exhaust seats for use with leaded or unleaded fuel
• New 1.440" high performance springs set up to match cam
• New Valve guides
• New Perfect Circle rings
• New Double row timing set
• New High volume oil pump with oversized steel drive shaft and bolt on oil pickup tube
• New Brass expansion plugs
• New Edelbrock Performer RPM aluminum intake manifold. This dual plane intake constant cross-sectional area design builds low end and mid-range acceleration while optimized runner path make top-end hp
• For those of you that have the hood clearance we will include a 2" high intake to carb spacer to increase plenum volume. This spacer increases the carb-to-plenum floor distance which atomizes the fuel better and also enhances low-rpm torque and throttle response. This engine takes a square bore carb. It works best with a 850cfm or 870cfm carb (not included)
• All parts are painted separately before assembly for that show quality look
• New Front sump oil pan

This engine comes completely assembled with front sump oil pan, timing cover, harmonic balancer, valve covers, and Edelbrock intake manifold.